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The Number and Name properties both have setters, so this is clearly not an immutable type. This might not seem like a problem we can do more or less exactly the same with this type as we did with int just a moment ago:

Confidentiality: DVD-Factory doesn t want competitors to be able to see exactly how many or which DVDs Alice happens to be ordering from DVD-Factory, because that may give them competitive information The SSL protocol encrypts all of the communication between Alice and the DVD-Factory web site with an algorithm such as Triple DES (We cover SSL in more detail in 15, and we cover Triple DES and other encryption algorithms in s 12 and 13) Message Integrity: Suppose that Alice wants to order ten DVDs from DVD-Factory, but an attacker wants to alter her order to zero DVDs If the attacker succeeds and DVDFactory gets a message saying that Alice has ordered zero DVDs, her job may be affected, since no DVDs are actually going to be shipped Alice may eventually get frustrated with DVD-Factory and might decide to go to a competitor (who may be behind this mischief).

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ArrayAndIndexer<CanChange> aai = new ArrayAndIndexer<CanChange>(); aai.TheArray[10] = new CanChange { Number = 42 }; Console.WriteLine(aai[10].Number); aai[20] = new CanChange { Number = 99, Name = "My item" }; Console.WriteLine(aai.TheArray[20].Number);

That works fine. The problem arises when we try to modify a property of one of the values already inside the array. We can do it with the array:

aai.TheArray[10].Number = 123; Console.WriteLine(aai.TheArray[10].Number);

That works it prints out 123 as you d expect. But this does not work:

Start up the test harness by selecting Debug Start Debugging. After the test harness appears in Internet Explorer, go into VWD, and open the Script Explorer by selecting Debug Windows Script Explorer (see Figure 9-16).

aai[20].Number = 456;

Message and data integrity are very important to prevent such mischief The SSL protocol uses message authentication codes in the messages that are sent between Alice and the web site to make sure that no competitor or other malicious party can tamper with the data Availability: DVD-Factory may have a competitor that launches a DoS attack against the site in order that Alice will stop buying from DVD-Factory and instead come to their competing site As part of DVD-Factory s security strategy, its web site needs to be kept running and available 24 hours a day, 7 days a week One simple (but potentially expensive) approach that DVD-Factory might use to mitigate a DoS attack against it would be to overprovision their bandwidth to handle the increased traffic load caused by illegitimate clients.

If you try this, you ll find that the C# compiler reports the following error:

error CS1612: Cannot modify the return value of 'ArrayAndIndexer<CanChange>.this[int]' because it is not a variable

That s a slightly cryptic message. But the problem becomes clear when we think about what we just asked the compiler to do. The intent of this code:

aai[20].Number = 456;

You can read more about overprovisioning and other approaches to mitigating DoS attacks in Internet Denial of Service Attack and Defense Mechanisms, by Jelena Mirkovic et al Accountability: To ensure accountability, every time Alice places an order from the DVD-Factory web site, it produces a log entry so that Alice cannot later claim to have not ordered the DVDs This may sound a bit like non-repudiation, but it is actually accountability, since the goal is to simply keep a log of what Alice has and has not done Non-repudiation: It is possible for DVD-Factory to cheat and report that Alice ordered more DVDs than she actually did If the web browser and web site run a non-repudiation protocol, it is then possible for Alice to prove to a third party that she only ordered, say, 10 DVDs, and not the 12 that DVD-Factory may claim she ordered..

seems clear we want to modify the Number property of the item whose index is 20. And remember, this line of code is using our ArrayAndIndexer<T> class s indexer. Looking at Example 7-26, which of the two accessors would you expect it to use here Since

we re modifying the value, you might expect set to be used, but a set accessor is an all or nothing proposition: calling set means you want to replace the whole element. But we re not trying to do that here we just want to modify the Number property of the value, leaving its Name property unmodified. If you look at the set code in Example 7-26, it simply doesn t offer that as an option it will completely replace the element at the specified index in the array. The set accessor can come into play only when we re providing a whole new value for the element, as in:

aai[20] = new CanChange { Number = 456 };

That compiles, but we end up losing the Name property that the element in that location previously had, because we overwrote the entire value of the element. Since set doesn t work, that leaves get. The C# compiler could interpret this code:

The Script Explorer should open, and you can see all of the JavaScript files that can be debugged (see Figure 9-17).

aai[20].Number = 456;

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